package com.ruoyi.web.controller.common;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.code.kaptcha.Producer;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.utils.sign.Base64;
import com.ruoyi.common.utils.uuid.IdUtils;
import com.ruoyi.system.service.ISysConfigService;

/**
 * 验证码操作处理
 * 
 * @author ruoyi
 */
@RestController
public class CaptchaController
{

    @Autowired
    @Qualifier("captchaProducer")
    private Producer captchaProducer;

    @Autowired
    @Qualifier("captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisCache redisCache;
    
    @Autowired
    private ISysConfigService configService;

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public AjaxResult getCode(HttpServletResponse response) throws IOException {
        AjaxResult ajax = AjaxResult.success();
        boolean captchaEnabled = configService.selectCaptchaEnabled();
        ajax.put("captchaEnabled", captchaEnabled);
        if (!captchaEnabled){
            return ajax; // 验证码关闭，不需要生成验证码。
        }
        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;
        String capStr = null;
        String code = null;
        BufferedImage image = null;
        // 生成验证码  todo 可以改成一个策略模式，匹配多个生成验证码策略。
        String captchaType = RuoYiConfig.getCaptchaType(); // 验证码类型 math 数字计算 char 字符验证
        if ("math".equals(captchaType)) {
            String capText = captchaProducerMath.createText();  // 生成数学验证码的文本
            capStr = capText.substring(0, capText.lastIndexOf("@"));  // 获取数学表达式部分
            code = capText.substring(capText.lastIndexOf("@") + 1);  // 获取答案部分
            image = captchaProducerMath.createImage(capStr);  // 根据数学表达式生成验证码图片
        } else if ("char".equals(captchaType)) {
            capStr = code = captchaProducer.createText();  // 生成字符验证码文本，并将其赋值给 capStr 和 code
            image = captchaProducer.createImage(capStr);   // 根据文本生成验证码图片
        }
        redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return AjaxResult.error(e.getMessage());
        }
        ajax.put("uuid", uuid);
        ajax.put("img", Base64.encode(os.toByteArray()));
        return ajax;
    }

}
